The Canon BG-E3 vertical Grip/Battery Holder is a must have for proffesionals shooting in the field. The BG-E3 makes it possible to hold extra batteries; making sure that you don't have to worry about your camera dying at an inportant moment. The battery grip also makes holding the camera a lot more confortable to hold especially in vertical shooting situations. The Canon BG-E3 accepts one or two NB-2LH batteries, six AA batteries or DR-700 Coupler.